sudo aptitude install debootstrap coreutils util-linux e2fsprogs
df -h
#!/bin/bash | |
sudo apt-get install clang libicu-dev libcurl4-openssl-dev lldb git wget unzip -y | |
wget https://swift.org/builds/swift-4.1-release/ubuntu1604/swift-4.1-RELEASE/swift-4.1-RELEASE-ubuntu16.04.tar.gz | |
tar zxf swift-4.1*.tar.gz && rm -rf swift-4.1*.tar.gz | |
sudo mv swift-4.1* /swift-4.1 | |
echo "export PATH=/swift-4.1/usr/bin:\"\${PATH}\"" >> ~/.bashrc | |
source ~/.bashrc |
Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
#!/bin/bash | |
# www.fduran.com | |
# script that will send an email to EMAIL when disk use in partition PART is bigger than %MAX | |
# adapt these 3 parameters to your case | |
MAX=95 | |
[email protected] | |
PART=sda1 | |
USE=`df -h |grep $PART | awk '{ print $5 }' | cut -d'%' -f1` | |
if [ $USE -gt $MAX ]; then |
import fcntl | |
import os | |
import struct | |
import subprocess | |
# Some constants used to ioctl the device file. I got them by a simple C | |
# program. | |
TUNSETIFF = 0x400454ca | |
TUNSETOWNER = TUNSETIFF + 2 |
// a) As Mac OS X does not have byteswap.h | |
// needed this for a c util I had used over the years on linux. | |
// did not find a solution to stopgap via macports, sadly, but this did the trick | |
#if HAVE_BYTESWAP_H | |
#include <byteswap.h> | |
#else | |
#define bswap_16(value) \ | |
((((value) & 0xff) << 8) | ((value) >> 8)) |